Double-colored injection molding machine and control method

Abstract

The invention discloses a double-colored injection molding machine and a control method. The double-colored plastic injection machine comprises a base, a movable table, a first injection table, a second injection table, a control unit, a motor, a lead screw, a nut, a first electronic ruler and a second electronic ruler, the first injection table and the second injection table are arranged on the movable table side by side, the movable table is arranged on the base in a sliding mode, the lead screw is sleeved with the nut and fixedly connected with the movable table, the motor is in transmission connection with the lead screw, and the first electronic ruler and the second electronic ruler are both arranged between the base and the movable table and used for detecting the position of the movable table relative to the base. And the first electronic ruler, the second electronic ruler and the motor are electrically connected with the control unit, so that the control unit controls the motor to stop working when the position readings of the first electronic ruler and the second electronic ruler are inconsistent. According to the double-colored plastic injection machine, the position of the injection table can be automatically adjusted, the equipment utilization rate and the production flexibility are remarkably improved, and the situation that the movement position of the injection table is inaccurate due to the fault of a single electronic ruler can be prevented.

Description

Technical Field

[0001] This invention belongs to the field of injection molding machine technology, and specifically relates to a two-color injection molding machine and its control method. Background Technology

[0002] Two-color injection molding machines are specialized equipment capable of molding two colors / materials in a single machine. Equipped with dual injection units, they can perform two-stage injection molding, fusing two different colors or properties of plastics into a single finished product. They are widely used in the production of products in consumer electronics, automotive parts, home appliances, and medical supplies. The main types of two-color injection molding machines are horizontal and vertical. For horizontal two-color injection molding machines, the position of the injection station needs to be adjusted according to the single-color or two-color mode during molten material injection.

[0003] Currently, the adjustment of the injection stage in horizontal two-color injection molding machines mainly relies on manual mechanical adjustment. For example, an existing patent (CN214056178U) discloses an injection molding machine dual-injection stage movement center adjustment device. The operator manually rotates a handle to rotate the lead screw, which in turn moves the dual injection stages. Each mode switch (two-color → single color) requires a shutdown of ≥1 hour, which seriously affects the production schedule. Furthermore, each mode switch (such as two-color → single color) requires a complete shutdown to ensure operator safety, making it impossible to maintain production continuity. In addition, the movement accuracy of the dual injection stages depends entirely on the operator's experience and records the number of lead screw rotations through a mechanical counter, rather than the actual physical position, which is prone to human error, resulting in inaccurate alignment between the injection nozzle and the mold, affecting the product qualification rate. Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses a two-color injection molding machine and a control method to overcome or at least partially solve the problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The present invention discloses a two-color injection molding machine, which includes a base, a moving table, a first injection stage, a second injection stage, a control unit, a motor, a lead screw, a lead screw nut, a first electronic ruler, and a second electronic ruler; The first and second injection stages are arranged side by side on the movable stage. The movable stage is slidably mounted on the base, and the sliding direction is perpendicular to the injection direction of the injection stage. The lead screw is sleeved on the lead screw and fixedly connected to the movable stage. The motor is drivenly connected to the lead screw. The first and second electronic rulers are both located between the base and the movable stage, and are used to detect the position of the movable stage relative to the base. The first electronic ruler, the second electronic ruler, and the motor are all electrically connected to the control unit, so that the control unit controls the motor to stop working when the position readings of the first and second electronic rulers are inconsistent.

[0006] Furthermore, the two-color injection molding machine also includes a switch control unit and a screen control unit; Both the switch control unit and the screen control unit are electrically connected to the control unit and can output electrical signals to the control unit, so that the control unit controls the moving stage to move to the first monochrome injection position, the second monochrome injection position, or the dual-color injection position according to the electrical signals.

[0007] Furthermore, after the control unit acquires the electrical signal output by the switch control unit, it cuts off the acquisition of the electrical signal from the screen control unit; after the control unit acquires the electrical signal output by the screen control unit, it cuts off the acquisition of the electrical signal from the switch control unit.

[0008] Furthermore, the switch control unit includes three switch groups; The three switch groups are connected in series on three wires between the control unit and the signal power supply, such that when one of the wires is conducting, the remaining two wires form an open circuit.

[0009] Furthermore, each of the switch groups includes three interlocking switches and one safety switch. The three interlocking switches are respectively installed on the three wires, and the safety switch is installed on one of the wires. The safety switches in the three switch groups are located on different wires. In the same switch group, when the interlock switch connected in series with the safety switch is closed, the remaining two interlock switches are open; when the interlock switch connected in series with the safety switch is open, the remaining two interlock switches are closed.

[0010] Furthermore, the screen control unit includes an operation screen; The operation panel is electrically connected to the control unit and is used by the operator to input control requirements.

[0011] Furthermore, the two-color injection molding machine also includes a first proximity switch and a second proximity switch; Both the first and second injection stages can slide along the injection direction on the moving stage. The first proximity switch is disposed between the first injection stage and the moving stage, and the second proximity switch is disposed between the second injection stage and the moving stage. When the first and second injection stages retreat to a safe area, the first and second proximity switches are triggered. Both the first and second proximity switches are electrically connected to the control unit.

[0012] Furthermore, the two-color injection molding machine also includes a motor starter and an air circuit breaker; The motor is electrically connected to the control unit via the motor starter, and the air circuit breaker is located between the motor starter and the power supply.

[0013] Another aspect of the present invention discloses a control method for a two-color injection molding machine, the control method being based on the aforementioned two-color injection molding machine, comprising: Obtain the target location that the mobile station needs to move to, and determine whether the first and second shooting stations are located in a safe area. If they are located in a safe area, then proceed with the subsequent steps. Based on the current position data of the first electronic ruler and the second electronic ruler, determine whether the first electronic ruler and the second electronic ruler have malfunctioned. If the first electronic ruler and the second electronic ruler have malfunctioned, issue an electronic ruler malfunction signal. If the first electronic ruler and the second electronic ruler have not malfunctioned, proceed with the subsequent steps. Determine whether the current position of the mobile station is the target position. If the current position is the target position, proceed with the next steps. If the current position is not the target position, control the motor to drive the mobile station to move until the current position is the target position. The position data of the first electronic ruler is read in real time. After the mobile platform moves to the target position, the position data of the second electronic ruler is compared with the position data of the first electronic ruler. If the position data are consistent, a positioning signal is issued. If the position data are inconsistent, an electronic ruler fault signal is issued.

[0014] Furthermore, the control method further includes: The first and second electronic rulers are calibrated periodically, and the corresponding positions of the mobile station in each mode are set.

[0015] Furthermore, the step of periodically calibrating the first and second electronic rulers and setting the corresponding positions of the mobile station in each mode includes: The first and second electronic rulers are periodically calibrated so that they are both at the same zero position. Then, the motor is controlled to drive the moving stage to move. When the moving stage moves to the first single-color injection position, the second single-color injection position, and the two-color injection position, the values ​​of the first and second electronic rulers are recorded and stored in the control unit.

[0016] The advantages and beneficial effects of this invention are: In the dual-color injection molding machine of this invention, the automatic adjustment of the injection stage position is achieved through the cooperation of a motor and an electronic ruler. The switching between dual-color injection mode and single-color injection mode takes only 90 seconds, which significantly improves equipment utilization and production flexibility. Furthermore, the injection molding machine can quickly, accurately, and safely move the injection stage to the preset position without stopping the machine or interrupting power, completely avoiding the long downtime required by traditional manual adjustment methods, thereby avoiding safety hazards, greatly improving production efficiency, and reducing maintenance costs and operational risks. In addition, by continuously comparing the feedback data from the two electronic rulers, it is possible to prevent the inaccurate movement position of the injection stage caused by the failure of a single electronic ruler, ensuring that the nozzle of the injection stage and the mold inlet always maintain precise alignment. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a three-dimensional structural diagram of a two-color injection molding machine from the front view in one embodiment of the present invention; Figure 2 This is a three-dimensional structural view of a two-color injection molding machine from the rear view in one embodiment of the present invention; Figure 3 This is a schematic diagram of the electrical principle of a two-color injection molding machine in one embodiment of the present invention; Figure 4 This is a diagram illustrating the implementation steps of a control method for a two-color injection molding machine in one embodiment of the present invention; Figure 5 This is a control flowchart of a control method for a two-color injection molding machine in one embodiment of the present invention; Figure 6 This is a diagram of the control interface on the operation screen in one embodiment of the present invention.

[0018] In the diagram: 1. Base; 2. Moving platform; 3. First shooting platform; 4. Second shooting platform; 5. Motor; 6. Lead screw; 7. Lead nut; 8. First electronic ruler; 9. Second electronic ruler; 10. Slide rail; 11. Slider; 12. Controller; 13. Switch group; 13-1. Interlock switch; 13-2. Safety switch; 14. Wire; 15. First proximity switch; 16. Second proximity switch; 17. Motor starter; 18. Air circuit breaker; 19. Control interface; 19-1. Shooting platform position selection window; 19-2. Electronic ruler position input window. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] The terms "first" and "second" in the specification and claims of this invention may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0024] One embodiment of the present invention provides a two-color injection molding machine, such as... Figures 1 to 3 As shown, the two-color injection molding machine includes a base 1, a moving stage 2, a first injection stage 3, a second injection stage 4, a control unit, a motor 5, a lead screw 6, a lead screw nut 7, a first electronic ruler 8, and a second electronic ruler 9.

[0025] The first injection stage 3 and the second injection stage 4 are arranged side by side on the movable stage 2, respectively for injecting melts of different colors. The movable stage 2 is slidably mounted on the base 1, and the sliding direction is perpendicular to the injection direction of the injection stage. Specifically, a slide rail 10 is provided on the upper end surface of the base 1. The length direction of the slide rail 10 is perpendicular to the injection direction of the injection stage. A slider 11 is slidably mounted on the slide rail 10. The slider 11 is fixedly connected to the lower end surface of the movable stage 2, thereby allowing the first injection stage 3 and the second injection stage 4 to slide on the base 1. A nut 7 is sleeved on the lead screw 6 and fixedly connected to the movable stage 2. The motor 5 is driven by the lead screw 6. The rotation of the motor 5 drives the movable stage 2 to slide on the base 1. In order to increase the output torque of the motor 5, a reducer can be set between the motor 5 and the lead screw 6 for speed reduction and torque increase, ensuring that the motor 5 can stably drive the movable stage 2 to slide.

[0026] Furthermore, both the first electronic ruler 8 and the second electronic ruler 9 are disposed between the base 1 and the moving stage 2. For example, the ruler body is fixed on the base 1, and the linear guide slider of the electronic ruler is fixed on the moving stage 2. The first electronic ruler 8 and the second electronic ruler 9 are used to detect the position of the moving stage 2 relative to the base 1. Preferably, the first electronic ruler 8 and the second electronic ruler 9 are disposed on the left and right sides of the moving stage 2 along the injection direction of the injection platform, that is, respectively disposed on the moving stage 2 below the first injection platform 3 and the second injection platform 4. The control unit includes a controller 12, and the first electronic ruler 8, the second electronic ruler 9, and the motor 5 are all electrically connected to the controller 12.

[0027] Understandably, the controller 12 can acquire the position data of the first electronic ruler 8 and the second electronic ruler 9, and based on the position data on the electronic rulers and the position that the moving platform 2 needs to move to, it controls the motor 5 to rotate, driving the moving platform 2 to move to the required position, thereby realizing the automatic adjustment of the injection platform position. This enables the synchronous, rapid, and precise horizontal positioning and movement of the two injection platforms of the two-color injection molding machine, completing the flexible switching between the two-color injection mode and the single-color injection mode. This allows the two-color injection molding machine to simultaneously possess the complete functions of a single-color injection molding machine, expanding the application scenarios of the equipment, enhancing the investment value of the equipment, and compressing the mode switching time to ≤90 seconds. Since there is no need for manual adjustment of the injection platform position, there is no need to power off the injection molding machine, enabling the injection molding machine to support online, rapid, and safe barrel replacement, improving the overall efficiency of the equipment, and solving the problems of reduced production efficiency caused by the need to stop and power off the machine when switching between multi-color and single-color modes in traditional two-color injection molding machines, as well as the inefficiency and large accuracy errors caused by relying on manual labor.

[0028] Meanwhile, the electronic ruler can provide real-time position feedback and work with motor 5 to form a fully closed-loop redundant feedback, enabling the injection station to move precisely to the required position and achieve micron-level precision in synchronous and repeatable positioning of the injection station, ensuring that the nozzle of the injection station and the mold inlet always remain precisely aligned.

[0029] In addition, the control unit of this embodiment controls the motor 5 to stop working when the position readings of the first electronic ruler 8 and the second electronic ruler 9 are inconsistent. That is, it continuously compares and analyzes the feedback data of the two electronic rulers. Once one of the electronic rulers fails, the system can immediately identify it and control the motor 5 to stop working, thereby avoiding the shooting platform movement deviation or collision accident caused by the failure of the electronic ruler, and ensuring the safety of equipment and personnel.

[0030] In this embodiment, the two-color injection molding machine also includes a switch control unit and a screen control unit.

[0031] Both the switch control unit and the screen control unit are electrically connected to the control unit and can output electrical signals to the control unit, so that the control unit controls the moving stage 2 (shooting stage) to move to the first single-color injection position, the second single-color injection position, or the dual-color injection position according to the electrical signals, thereby realizing different injection modes.

[0032] Understandably, operators can control the injection molding machine to switch modes through the switch control unit and the screen control unit. That is, the mode can be switched through both the switch and the screen, realizing "one-click" mode switching. This upgrades the injection molding machine from an isolated device to an intelligent node that can communicate bidirectionally with the upper-level production management system, greatly improving the level of production flexibility and intelligence, while making operation more convenient and easy.

[0033] Furthermore, after the control unit receives the electrical signal output by the switch control unit, it cuts off the electrical signal from the screen control unit; similarly, after receiving the electrical signal output by the screen control unit, the control unit cuts off the electrical signal from the switch control unit. Specifically, once the control unit receives the mode switching signal from the switch control unit, it cannot control the mode switching through the screen control unit, and therefore cannot control the motor 5's movement through the screen control unit. This interlocking of hardware and software control eliminates the risk of human error and reduces the accident rate to zero.

[0034] In addition, such as Figure 3 As shown, the switch control unit includes three switch groups 13; wherein the three switch groups 13 can be respectively installed in three button boxes.

[0035] Specifically, three switch groups 13 are connected in series on three wires 14 between the controller 12 and the signal power supply. These three wires 14 correspond to three types of signals (i.e., a first monochrome injection signal, a second monochrome injection signal, and a dual-color injection signal); for example, Figure 3 The topmost wire 14 corresponds to the input of the first monochrome injection signal. Figure 3 The middle wire 14 corresponds to the input of the second monochrome injection signal. Figure 3 The bottom wire 14 corresponds to the input dual-color injection signal.

[0036] When the controller 12 receives a specific signal, it executes the corresponding mode (first single-color injection mode, second single-color injection mode, or dual-color injection mode). The three switch groups 13 can control the on / off state of the three wires 14 respectively. Therefore, the three modes can be controlled separately through the three switch groups 13, making operation more intuitive and convenient. When one switch group 13 is closed, making its corresponding wire 14 conductive, the remaining two switch groups 13 automatically open, thus creating an open circuit between the remaining two wires 14, ensuring that the controller 12 can only receive one signal. The interlocking design of the three switch groups 13 avoids signal conflicts caused by the controller 12 simultaneously receiving multiple signals due to misoperation, ensuring the safety and stability of the system.

[0037] Among them, such as Figure 3As shown, each switch group 13 includes three interlocking switches 13-1 and one safety switch 13-2. The three interlocking switches 13-1 are interconnected and are respectively installed on three wires 14. The safety switch 13-2 is installed on one of the wires 14, and the safety switches 13-2 in the three switch groups 13 are located on different wires 14. When a wire 14 needs to form a circuit, the interlocking switches 13-1 and the safety switch 13-2 on it need to be closed at the same time. This redundancy design can further avoid the occurrence of misoperation.

[0038] In the same switch group 13, when the interlock switch 13-1 connected in series with the safety switch 13-2 is closed, the remaining two interlock switches 13-1 are open. When the interlock switch 13-1 connected in series with the safety switch 13-2 is open, the remaining two interlock switches 13-1 are closed, thus forming an interlock of the three switch groups 13. This allows the operator to control which of the three wires 14 is conducting by selecting to close specific interlock switches 13-1 and safety switches 13-2, thereby achieving precise control of the system.

[0039] It should be noted that in the same switch group 13, the interlock switch 13-1, which is located on the same wire 14 as the safety switch 13-2, is an active switch and can be directly controlled manually. The other two interlock switches 13-1 are passive switches and cannot be directly controlled manually; they can only be indirectly controlled through the active switches. Without any operation, the active switches and safety switch 13-2 in all three switch groups 13 are in the open state, and the controller 12 cannot obtain signals through the switch control unit.

[0040] For example, when the injection molding machine needs to execute the first single-color injection mode, Figure 3 Simply turn off the active switch and safety switch 13-2 in the switch group 13 on the left side; when the injection molding machine needs to execute the second single-color injection mode, turn off the active switch and safety switch 13-2. Figure 3 Simply turn off the active switch and safety switch 13-2 in the middle switch group 13; when the injection molding machine needs to execute the two-color injection mode, turn off the active switch and safety switch 13-2. Figure 3 Simply turn off the active switch and safety switch 13-2 in the switch group 13 on the right side.

[0041] Understandably, based on the above design, the two-color injection molding machine in this embodiment can not only achieve physical interlocking of hardware, but also interlocking of hardware and software, thus constructing a multi-layered, proactive safety protection system, fundamentally eliminating the risk of collision caused by misoperation during the automatic movement of large equipment.

[0042] In this embodiment, as Figure 2 and Figure 3 As shown, the two-color injection molding machine also includes a first proximity switch 15 and a second proximity switch 16.

[0043] Specifically, both the first injection stage 3 and the second injection stage 4 can slide on the moving stage 2 along the injection direction. The first injection stage 3 and the second injection stage 4 can also slide on the moving stage 2 via a slide rail slider structure. A first proximity switch 15 is located between the first injection stage 3 and the moving stage 2, and a second proximity switch 16 is located between the second injection stage 4 and the moving stage 2. When the first injection stage 3 and the second injection stage 4 retract to a safe area, they can respectively touch the first proximity switch 15 and the second proximity switch 16. Both the first proximity switch 15 and the second proximity switch 16 are electrically connected to the controller 12. The placement of the first proximity switch 15 and the second proximity switch 16 allows for the determination of whether the first injection stage 3 and the second injection stage 4 have moved to a safe area, thereby ensuring the safe operation of the system.

[0044] It should be noted that when the first injection stage 3 and the second injection stage 4 retract to the safe area, the first injection stage 3 and the second injection stage 4 will not touch the mold closing structure of the injection molding machine when they move in the left and right directions.

[0045] And, as Figure 3 As shown, the two-color injection molding machine also includes a motor starter 17 and an air circuit breaker 18.

[0046] Motor 5 is electrically connected to control unit (controller 12) through motor starter 17. Motor starter 17 controls the start, stop and forward / reverse rotation of motor 5. Air circuit breaker 18 is installed between motor starter 17 and power supply to realize short circuit protection, overload protection and undervoltage protection of the circuit where motor 5 is located.

[0047] In addition, the screen control unit includes an operation screen.

[0048] The control panel is electrically connected to the control unit, allowing the operator to input control requirements (such as mode switching) for easier operation.

[0049] Another embodiment of the present invention provides a control method for a two-color injection molding machine, which is based on the two-color injection molding machine described in the above embodiments, such as... Figure 4 As shown, the control method specifically includes: Step 01: Obtain the target position that the mobile station 2 needs to move to, and determine whether the first firing station 3 and the second firing station 4 are located in the safe area. If they are located in the safe area, proceed with the subsequent steps.

[0050] Specifically, such as Figure 5As shown, the operator selects the target mode (i.e., the target position that the moving platform 2 needs to move to) through the operation screen or switch group 13. The control unit obtains the target position and determines whether the first injection stage 3 and the second injection stage 4 have retreated to the safe area based on the state of the first proximity switch 15 and the second proximity switch 16. If both the first injection stage 3 and the second injection stage 4 are in the safe area, the next step is executed; if either the first injection stage 3 or the second injection stage 4 is not in the safe area, it is displayed that the injection stage has not retreated to the correct position, thereby avoiding collisions with the mold closing structure when the motor 5 drives the first injection stage 3 and the second injection stage 4 to move in the left and right directions, effectively ensuring the safe operation of the injection molding machine.

[0051] Step 02: Based on the current position data of the first electronic ruler 8 and the second electronic ruler 9, determine whether the first electronic ruler 8 and the second electronic ruler 9 have malfunctioned. If the first electronic ruler 8 and the second electronic ruler 9 have malfunctioned, issue an electronic ruler malfunction signal. If the first electronic ruler 8 and the second electronic ruler 9 have not malfunctioned, proceed to the next step. The electronic ruler malfunction signal can be transmitted to the operator via a display on the operation screen or via an alarm.

[0052] Specifically, such as Figure 5 As shown, the control unit acquires the current position data of the first electronic ruler 8 and the current position data of the second electronic ruler 9, and compares these two position data to determine whether the measured positions of the two electronic rulers are the same. If they are the same, the next step is performed; if they are different, it indicates that at least one electronic ruler has malfunctioned, and an electronic ruler malfunction signal is output, thereby avoiding inaccurate positioning of the shooting platform due to electronic ruler malfunction.

[0053] Step 03: Determine whether the current position of the mobile station 2 is the target position. If the current position is the target position, proceed with the next steps. If the current position is not the target position, control the motor 5 to drive the mobile station 2 to move until the current position is the target position.

[0054] Specifically, such as Figure 5 As shown, when the measurement positions of the two electronic rulers are the same, the measurement results of the first electronic ruler 8 and the second electronic ruler 9 are used to determine whether the current position of the moving stage 2 is the same as the target position that the moving stage 2 needs to move to. If they are the same, it indicates that the moving stage 2 is currently at the target position and does not need to move. A positioning signal is issued, and the next step is executed. If they are not the same, the control unit outputs a forward or reverse rotation command to the motor 5, and the motor 5 drives the moving stage 2 to move until the current position of the moving stage 2 is consistent with the target position.

[0055] Step 04: Read the position data of the first electronic ruler 8 in real time. After the mobile station 2 moves to the target position, compare the position data of the second electronic ruler 9 with the position data of the first electronic ruler 8. If the position data are consistent, issue a position signal; if the position data are inconsistent, issue an electronic ruler fault signal.

[0056] Specifically, such as Figure 5 As shown, the control unit reads the position data of the first electronic ruler 8 in real time. After the moving platform 2 moves to the target position, it reads the position data of the second electronic ruler 9 and compares it with the position data of the first electronic ruler 8. If the two position data match, it indicates that both electronic rulers are in normal condition and the moving platform 2 has accurately moved to the target position. At this time, the control motor 5 stops working and sends a signal that the target position has been reached. If the two position data do not match, it indicates that at least one electronic ruler is faulty and the moving platform 2 has a positional deviation. At this time, an electronic ruler fault signal is output to facilitate the operator's maintenance. The electronic ruler fault signal can be transmitted to the operator through the operation screen display or through an alarm.

[0057] Overall, the system can efficiently and accurately control the mobile station 2 to move to the target position, and ensure the accuracy of the position through data comparison, avoiding movement errors caused by electronic ruler malfunction.

[0058] Furthermore, the control methods also include: The first electronic ruler 8 and the second electronic ruler 9 are calibrated regularly to ensure consistency in their measurement data, thereby guaranteeing the accuracy of the measurement data and reducing accumulated errors caused by long-term use. The corresponding positions of the moving stage 2 in each mode are also set to ensure that the nozzle of the injection station and the mold inlet remain precisely aligned when the moving stage 2 reaches its corresponding position in each mode, avoiding positional errors caused by mechanical wear. The calibration of the first electronic ruler 8 and the second electronic ruler 9 can be performed at any time from three months to one year.

[0059] The process includes periodically calibrating the first electronic ruler 8 and the second electronic ruler 9, and setting the execution of the corresponding position of the moving stage 2 in each mode, including: The first electronic ruler 8 and the second electronic ruler 9 are periodically calibrated so that they are both at the same zero position. Then, the motor 5 is controlled to drive the moving stage 2 to move. When the moving stage 2 moves to the first single-color injection position, the second single-color injection position, and the two-color injection position, the values ​​of the first electronic ruler 8 and the second electronic ruler 9 are recorded and stored in the control unit.

[0060] Understandable, firstly, such as Figure 6As shown, in the control interface 19 of the operation screen, the injection mode is selected in the injection station position selection window 19-1; next, the control motor 5 drives the moving stage 2 to move to the position corresponding to the injection mode, and aligns the nozzle of the injection station with the mold inlet; then, the position values ​​of the first electronic ruler 8 and the second electronic ruler 9 are read and recorded in the electronic ruler position input window 19-2; finally, the injection mode and position data are bound and stored in the control unit. In this way, after selecting the injection mode on the control interface 19 of the operation screen, the injection station can move accurately to the corresponding position, and the nozzle of the injection station is precisely aligned with the mold inlet.

[0061] In one specific embodiment, the control method of the present invention is applied to an MX1600-1400 / 750 / 750 injection molding machine. When switching from A / E two-color mode (two-color injection mode) to A-stage single-color mode (first single-color injection mode), the operator only needs to select 'A-stage' on the control interface (or activate the button box corresponding to the A-stage mode), and the system automatically controls the motor to quickly and smoothly move the entire moving platform laterally to the preset 'single-color A position', with a positioning accuracy of ≤ 30μm. When switching back to E-stage single-color mode (second single-color injection mode), the operator selects 'E-stage' on the control interface (or activates the button box corresponding to the E-stage mode), and the system automatically controls the motor to quickly and smoothly move the entire moving platform laterally to the preset 'single-color E position'. This embodiment demonstrates that the control method of the present invention operates stably and reliably, significantly improving the operational convenience, production efficiency, and maintenance convenience of this model of two-color injection machine.

[0062] In summary, the dual-color injection molding machine of this invention, through the cooperation of a motor and an electronic ruler, enables automatic adjustment of the injection stage position. Switching between dual-color and single-color injection modes takes only 90 seconds, significantly improving equipment utilization and production flexibility. Furthermore, it allows the injection molding machine to quickly, accurately, and safely move the injection stage to a preset position without stopping the machine or interrupting power, completely avoiding the long downtime required by traditional manual adjustment methods, thus preventing safety hazards, greatly improving production efficiency, and reducing maintenance costs and operational risks. In addition, continuous comparison of feedback data from the dual electronic rulers prevents inaccurate injection stage movement caused by a single electronic ruler malfunction, ensuring that the injection nozzle and mold inlet remain precisely aligned at all times.

[0063] The above description is merely a specific embodiment of the present invention. Under the teachings of the present invention, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of the present invention, and the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A two-color injection molding machine characterized by comprising: The double-color injection molding machine comprises a base, a moving table, a first injection table, a second injection table, a control unit, a motor, a screw rod, a screw nut, a first electronic ruler and a second electronic ruler; The first injection table and the second injection table are arranged side by side on the moving table, the moving table is slidingly arranged on the base, the sliding direction is perpendicular to the injection direction of the injection table, the screw nut is sleeved on the screw rod and fixedly connected with the moving table, the motor is drivingly connected with the screw rod, the first electronic ruler and the second electronic ruler are arranged between the base and the moving table and used for detecting the position of the moving table relative to the base, and the first electronic ruler, the second electronic ruler and the motor are electrically connected with the control unit, so that the control unit controls the motor to stop working when the position readings of the first electronic ruler and the second electronic ruler are inconsistent.

2. The dual color injection molding machine of claim 1, wherein, The double-color injection molding machine further comprises a switch control unit and a screen control unit; The switch control unit and the screen control unit are electrically connected with the control unit and can output electric signals to the control unit, so that the control unit controls the moving table to move to a first single-color injection position, a second single-color injection position or a double-color injection position according to the electric signals.

3. The dual color injection molding machine of claim 2, wherein, After the control unit acquires the electric signal output by the switch control unit, the control unit cuts off the acquisition of the electric signal from the screen control unit; after the control unit acquires the electric signal output by the screen control unit, the control unit cuts off the acquisition of the electric signal from the switch control unit.

4. The dual color injection molding machine of claim 2, wherein, The switch control unit comprises three switch groups; The three switch groups are connected in series on three electric wires between the control unit and a signal power supply, so that when one of the electric wires is turned on, the remaining two electric wires form an open circuit.

5. The dual color injection molding machine of claim 4, wherein, Each of the switch groups comprises three interlocking switches and a safety switch, the three interlocking switches are arranged on the three electric wires respectively, and the safety switch is arranged on one of the electric wires and is located on a different electric wire in the three switch groups; In the same switch group, when the interlocking switch connected in series with the safety switch is turned on, the remaining two interlocking switches are turned off, and when the interlocking switch connected in series with the safety switch is turned off, the remaining two interlocking switches are turned on.

6. The dual color injection molding machine of claim 2, wherein, The screen control unit comprises an operation screen; The operation screen is electrically connected with the control unit and used for an operator to input control requirements.

7. The dual color injection molding machine of claim 1, wherein, The double-color injection molding machine further comprises a first proximity switch and a second proximity switch; The first injection table and the second injection table can slide on the moving table along the injection direction of the injection table, the first proximity switch is arranged between the first injection table and the moving table, the second proximity switch is arranged between the second injection table and the moving table, the first proximity switch and the second proximity switch are triggered when the first injection table and the second injection table retreat to a safety area, and the first proximity switch and the second proximity switch are electrically connected with the control unit.

8. The dual color injection molding machine according to any one of claims 1 to 7, characterized in that, The double-color injection molding machine further comprises a motor starter and an air circuit breaker; The motor is electrically connected with the control unit through the motor starter, and the air circuit breaker is arranged between the motor starter and a power supply.

9. A control method of a two-color injection molding machine, characterized by, The control method is based on the dual-color injection molding machine of claim 1, comprising: Obtaining a target position to which the mobile station needs to move to, and judging whether the first and second shooting stations are located in a safety area, if yes, executing the following steps; According to the current position data of the first and second electronic scales, judging whether the first and second electronic scales are faulty, if yes, sending an electronic scale fault signal, if not, executing the following steps; Judging whether the current position of the mobile station is the target position, if yes, executing the following steps, if not, controlling the motor to drive the mobile station to move until the current position is the target position; Real-time reading the position data of the first electronic scale, after the mobile station moves to the target position, comparing the position data of the second electronic scale with the position data of the first electronic scale, if consistent, sending a signal of reaching the target position, if not, sending an electronic scale fault signal.

10. The control method of the dual-color injection molding machine according to claim 9, characterized in that, The control method further comprises: Periodically calibrating the first and second electronic scales, and setting corresponding positions of the mobile station in each mode.

11. The control method of the dual-color injection molding machine according to claim 10, characterized in that, The execution of periodically calibrating the first and second electronic scales, and setting corresponding positions of the mobile station in each mode comprises: Periodically calibrating the first and second electronic scales, so that the first and second electronic scales are at the same zero position, then controlling the motor to drive the mobile station to move, when the mobile station moves to the first single-color injection position, the second single-color injection position and the dual-color injection position, recording the values of the first and second electronic scales respectively, and storing in the control unit.

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